User manual

Appendixes Phason
50
idle range
The temperature setting below which a variable stage's fan is off and the inlet is
closed. When the temperature is between the idle range and set point, the fan
operates at idle speed and the inlet is open the corresponding amount.
For more information, read Programming variable stages, parameters 2 to 9 on
page 30.
idle speed
The percentage of full power at which a variable speed fan operates for minimum
ventilation.
For more information, read Programming variable stages, parameters 2 to 9 on
page 30.
minimum
duration
The minimum amount of time an alarm condition must be present before the
SEC-HD signals an alarm. The minimum duration (one minute) prevents alarms
from activating when the temperature rises or drops for just a few seconds.
For more information, read Programming alarm settings, parameters 15 and on
page 35.
set point
For variable stages, the temperature above which fan speed increases toward its
maximum and the inlet opens proportionally. For more information, read
Programming variable stages, parameters 2 to 9 on page 30.
For relay stages, the temperature at which the stage switches between the OFF and
ON state. For more information, read Programming relay stages, parameters 10
to 14 on page 24.
spikes
Short-term deviations or changes from a desired voltage level or signal. These
deviations can cause damage to electronic devices, or cause them to malfunction.
Spikes are often caused by sudden excess power, also known as ‘power surges’, or
by drops in power, knows as ‘brown outs’.
For more information, read Understanding power surges and surge suppression
on page 9.
terminal
block
The part of your SEC-HD where you connect the wires for incoming power,
control elements, and so on.
For more information, read SEC-HD layout on page 12.
Appendix B: Troubleshooting
 If you see an alarm message and are not sure what it means, look it up in the Alarm and error
messages table on page 51 and then follow the instructions for resolving the alarm condition.
 If you are having a problem using your SEC-HD, see if the problem is described in the
Troubleshooting table on page 52 and then follow the directions for correcting the problem.